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Admin note: I split this topic out to its own thread since it's not part of the discussion of my kit.That's one of the great things about historical armor. There's so much to choose from.
For your historical combat, you can work with pretty much any of the armor suggested so far, in terms of time period. Longsword was going out of style in the 16th, but was actively trained in the 15th. Otherwise I don't think it matters too much.
The 15th century armor can be a real eye-opener. In our class last night, we did some light bouting with just thrusts and pommel strikes, and trying to go for actual weaknesses in the armor. Tom Leoni commented that he was just amazed at how hard it was, since my armor had such great coverage. He could really only aim for my palms.
So if you do any combat where the rules for target areas are "as worn", then 15th C armor with voiders, faulds, etc, will work really well.